Features:

  • Compatible with 95% of all available launchers either homemade or commercially available.
  • Works with various styles: cable ties, rubber stopper, expanding tube, nozzle, or O-ring.
  • No tools or glue required for assembly, simply screw-on to a 2 liter soda bottle or smaller.
  • Take your water rocketry to the next level of higher flights with screw-on StratoFins.
  • StratoFins kit includes 1 attachment ring and 3 fins along with an instruction sheet.
Screw these on to fly straight

I bought a simple water bottle rocket science kit a while back for my son and we had a blast playing with it until we successfully "landed" the rocket on the roof of his school. I ordered these StratoFins to replace the fins that came in the original kit and am very pleased. Adding these fins to a 2-liter bottle rocket really makes the whole thing fly much straighter. You can still get some wind drift on the way up, but there's no tumbling at all on the ascent. The fins also add some drag to slow down the fall and the whole thing crashes harmlessly onto the ground. One really cool feature of these is that they replicate the 2-liter bottle's cap screw. This makes the design compatible with cable-tie launcher bases, which is awesome. The original fins we got in our kit did not do this so we were stuck using the kit's included rubber stopper as the launch mechanism. Another nice thing about these is that the fins themselves separate from the screw-on collar for storage and travel. The only minor change I would like to have seen is a more rounded lip along the edge of the fins for a more aerodynamic profile (not that I think the current design impacts performance much). Overall we're thrilled with these and look forward to using them more as we blast our rockets off to even greater heights.

Pricey, but worth it, including as a backup set with the Relationshipware Launcher.

A little pricey for what they are, they do work great, and are a useful backup if the identical fins in their launcher kit get lost or broken. Of course, you can launch bottles with (or without) these, from about any launching stand, not just Relationshipware's, but they do stabilize the bottle in flight, and also make those bottles look like a "real" rocket. After experiencing a few launches, I'd say the likelihood of breakage is pretty small, and a single broken fin can be replaced 3 times from a spare set, as they are separately fitted. Most likely problem: loss on a windy day. Unless you have a huge open area to launch in, the bottles can go so high that the wind will carry them hundreds of yards, onto fenced properties, roofs, wood lots, weed patches, ponds, lakes or rivers, etc. Launching near Area 51? If the wind is blowing that way, keep the air pressure low! The Relationshipware launcher (with the "extra hole" modification) works so well that a spare set of fins is worth it to insure that increased altitude and "real rocket" looks aren't cut short by a mishap.

Great product, easy to use, very durable.

My 2-3 year old son and I have been launching bottle rockets in our yard and in fields around town for the past two summers. After about 200-300 launches, we finally managed to destroy the the foam fins that came with the Quest Aerospace Deluxe Single Water Rocket Set. My wife just got me these StratoFins for father's day, and my son and I love them. They make refilling the rocket much easier compared to the foam fins that we'd been using. These are easier to unscrew and re-screw on while refilling the bottles. Also it's easier to switch between bottles because the same fins can be used on multiple bottles, no need to make new fins for every bottle. We've used our StratoFins for a few dozen launches each on both 1liter and 2 liter bottles, and they work great. I think they'll last many more flights than the foam ones (which I was about to replace with self made replacements before I was surprised with these as a gift. We've had maybe five launches that landed on asphalt or in the gravel on tI hhe edge of the road. There is not a single sign of damage or even any marks that didn't easily wipe off with a shirt tail. The Stratofins came with a flat black rubber gasket inside the female end of the connector, and it creates at least a good a seal between bottle and Stratofins as the seal between the Stratofins and the Quest Aerospace nozzle that we're using. It's fun to use and decorate foam, cardboard or wooden fins when you first get into bottle rocketry. If you're wanting to conduct a range of experimental flights with different rockets or other changes of setup of other elements (other than the fins themselves) these are great. They are perfectly compatible with the Quest Aerospace launcher, and I haven't seen another launcher (store bought or homemade that they wouldn't work with, because they just replicate the bottle's threads on the aft side of the fins. The red color also makes for ideal visibility regardless of whether the sky is blue or overcast.

Great quality.

I wish they made these when I was a kid. We just shot the bottles without any fins. My son loved them. Good quality. Definitely recommend.

Huge improvement in flight altitude & stability

StratoFins greatly increase the altitude and stability of a 2 liter bottle rocket. Flies two-three times as high as the plain bottle did. So high, in fact, the wind above the soccer field caught it and blew the rocket into some trees--alas, we never found it. I immediately ordered a replacement set. We are using with the Aquapod Bottle Launcher and the fins work just fine (launcher latch engages raised ring on the fins). You do need to rotate the rocket/fins so they clear the launcher structure.

Bought this for Aquapod

I read the reviews from people who have an Aquapod and they said to use some plastic or a #67 o-ring. Well neither worked for me, so I contacted the seller and he got back to me very quickly. He tried several other o-rings and suggested I try a #9. I got that. It is a snug fit between the Aquapod and the fins, but otherwise works perfectly. The bottle goes up much higher now. I am using a 2 liter Diet Coke bottle. Don't push the bottle down all the way either because it will take longer to launch because of the snug fit. Experiment with this.

Does not work with Aquapod but easy to fix

The internal diameter is just a little bit bigger than that of a 2 liter bottle. I used it with an Aquapod launcher and the fit is not right leaking air. The bottle on its own fits perfectly and flies very high but with these fins attached the air starts to leak after the second pump. It is a shame as one of the product pictures shows it with an Aquapod launcher. Update December 29: As per manufacturer's suggestion I will try later with a thicker O-ring. In the meantime I used a strip of plastic from a supermarket bag. I folded it over once and rolled 5 times around the connection pipe (for a total of 10 layers of plastic). This made the fins to work and the difference i simply astounding. I had the idea that the fins only got a straighter flight but the range is also affected. Now the height is about twice of what I could get before. With this quick fix I can tell you that these fins are a must

sounds excellent!!!

ordered from autoplicity through amazon. was supposed to arrive wed-fri. got it tues am. great! cut out old exhaust and mocked up the diamond eye. all pipes fit excellent except tail pipe. no pipes were damaged, just wasn't expanded enough at manufacture to fit. had to modify to accept pipe. As this was a Ford kit fitting many models was advised may need modification to fit. one pipe had to be cut per instructions as i got straight pipe muffler replacement kit. also some hangers had to be cut to fit.I have auto experience so was no problem. might be a bit much for average person though. other than that excellent kit. great sound. reduced egt's. much more power than old exhaust. price was half what other companies wanted. If you're looking for an excellent exhaust at excellent price then this is it. You will not be disappointed!!!

I am anticipating lots of fun for all

The fins arrived on time and as advertised. I have not used them yet with my students. I am anticipating lots of fun for all.

Fun and effective

Fun and effective! They make soda bottle water rockets fly much straighter and higher. The only drawback is that then we needed a larger space to fly them because an errant rocket was able to drop down onto our neighbor's patio with a considerable amount of energy.

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